Re: doc eq? eqv? equal?

[Marius Vollmer]

Kevin Ryde <address@hidden> writes:

> In guile "(eq? x x)" is always going to be true, but I'm wondering if
> the docs should describe only the weaker r5rs behaviour, and advise
> eqv? for anything involving numbers.

Yes, comparing x with itself is probably rare and the general case
(eq? x y) is false for bignums.  So eqv? is the right thing to use for
numbers.  Or '=' if you want to make sure that you are dealing with
numbers.

    guile> (eq? (expt 2 20) (expt 2 20))
    #t
    guile> (eq? (expt 2 40) (expt 2 40))
    #f
    guile> (eqv? (expt 2 40) (expt 2 40))
    #t
    guile> (= (expt 2 40) (expt 2 40))
    #t